正序输出整数

1、

 1 /*
 2     正序输出整数的每一位数，数字之间用空格隔开
 3     123456    1 2 3 4 5 6
 4 */
 5 
 6 #include <stdio.h>
 7 int pow(int a, int b);
 8 
 9 int main()
10 {
11     int n;
12 
13     scanf_s("%d", &n);
14 
15     //判断一个数有几位
16     int count = 0;
17     int temp = n;
18     do
19     {
20         temp = temp / 10;
21         count++;
22     } while (temp!=0);
23 
24     //分离出每一位数
25     int digit;
26     temp = n;
27     do
28     {
29         digit = temp / pow(10, count - 1);
30         printf("%d", digit);
31         if (count > 1)
32         {
33             printf(" ");
34         }
35         temp = temp % pow(10, count - 1);
36         count--;
37     } while (count!=0);
38     
39     printf("\n");
40     return 0;
41 }
42 int pow(int a, int b)
43 {
44     int result = 1;
45     for (int i = 0; i < b; i++)
46     {
47         result = result * a;
48     }
49 
50     return result;
51 }

2、参考老师讲解视频修改版

 1 /*
 2     正序输出整数的每一位数，数字之间用空格隔开
 3     123456    1 2 3 4 5 6
 4 */
 5 
 6 #include <stdio.h>
 7 
 8 int main()
 9 {
10     int n;
11 
12     scanf_s("%d", &n);
13 
14     int count = 0;
15     int temp = n;
16     int mask = 1;
17     do
18     {
19         temp = temp / 10;
20         count++;
21         mask = mask * 10;
22     } while (temp!=0);
23 
24     mask = mask / 10;
25     //分离出每一位数
26     int digit;
27     temp = n;
28     do
29     {
30         digit = temp / mask;
31         printf("%d", digit);
32         if (count > 1)
33         {
34             printf(" ");
35         }
36         temp = temp % mask;
37         count--;
38         mask = mask / 10;
39     } while (count!=0);
40     
41     printf("\n");
42     return 0;
43 }